The dry and bright weather will raise pollen levels to very high on Tuesday & Wednesday on Merseyside.
Over 95% of hay fever sufferers are allergic to grass pollen, which is active from late May to July.
Most of the pollen is released in the early morning, falling to the ground when the air cools in the evening.
Drinking alcohol is said to be the worst activity to set off allergic reactions, as most drinks contain a histamine which leads to the classic symptoms of a runny nose and watery eyes.
Forecaster Calum MacColl said: “Pollen levels will rise to very high from Tuesday as we get a good deal of sunshine across the country.
“Tropical maritime air from the southwest will see temperatures rise by through the week with pollen levels staying high.”
Maureen Jenkins, clinical director of of Allergy UK said stormy weather can make hay fever symptoms worse.
She said: “It is important to point out that storms break up pollen particles and makes them more potent and this affects people more.
“The implications are that people with asthma or hay fever should take their medication and be careful when levels are high”.
Heavy rain is on the way Friday as a low pressure system will pull the remnants of Tropical Depression Bill into the UK, so pollen levels could stay high for the rest of the week.
You can now read what the weather will be like on Merseyside during the week by reading our dedicated weekly forecast page here. Why not bookmark it on your mobile so it’s easier to get to!